DOI: 10.5194/tc-10-775-2016
Scopus记录号: 2-s2.0-84966334416
论文题名: Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts
作者: Weiser U ; , Olefs M ; , Schöner W ; , Weyss G ; , Hynek B
刊名: Cryosphere
ISSN: 19940416
出版年: 2016
卷: 10, 期: 2 起始页码: 775
结束页码: 790
语种: 英语
英文关键词: albedo
; energy balance
; error analysis
; global climate
; radiation budget
; sensor
; slope angle
; snow cover
; solar radiation
; terrain
; zenith angle
英文摘要: Geometric effects induced by the underlying terrain slope or by tilt errors of the radiation sensors lead to an erroneous measurement of snow or ice albedo. Consequently, artificial diurnal albedo variations in the order of 1-20% are observed. The present paper proposes a general method to correct tilt errors of albedo measurements in cases where tilts of both the sensors and the slopes are not accurately measured or known. We demonstrate that atmospheric parameters for this correction model can either be taken from a nearby well-maintained and horizontally levelled measurement of global radiation or alternatively from a solar radiation model. In a next step the model is fitted to the measured data to determine tilts and directions of sensors and the underlying terrain slope. This then allows us to correct the measured albedo, the radiative balance and the energy balance. Depending on the direction of the slope and the sensors a comparison between measured and corrected albedo values reveals obvious over- or underestimations of albedo. It is also demonstrated that differences between measured and corrected albedo are generally highest for large solar zenith angles. © Author(s) 2016. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75159
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Central Institute for Meteorology and Geodynamics (ZAMG), Vienna, Austria; Institute of Geography and Regional Research, University of Graz, Graz, Austria
Recommended Citation:
Weiser U,, Olefs M,, Schöner W,et al. Correction of broadband snow albedo measurements affected by unknown slope and sensor tilts[J]. Cryosphere,2016-01-01,10(2)